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.\"
.ds xT X Toolkit Intrinsics \- C Language Interface
.ds xW Athena X Widgets \- C Language X Toolkit Interface
.ds xL Xlib \- C Language X Interface
.ds xC Inter-Client Communication Conventions Manual
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.ny0
.TH XChangeKeyboardMapping __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
.SH NAME
XChangeKeyboardMapping, XGetKeyboardMapping, XDisplayKeycodes, XSetModifierMapping, XGetModifierMapping, XNewModifiermap, XInsertModifiermapEntry, XDeleteModifiermapEntry, XFreeModifiermap, XModifierKeymap \- manipulate keyboard encoding and keyboard encoding structure
.SH SYNTAX
.HP
int XChangeKeyboardMapping(\^Display *\fIdisplay\fP, int \fIfirst_keycode\fP,
int \fIkeysyms_per_keycode\fP, KeySym *\fIkeysyms\fP, int \fInum_codes\fP\^); 
.HP
KeySym *XGetKeyboardMapping(\^Display *\fIdisplay\fP, KeyCode
\fIfirst_keycode\fP, int \fIkeycode_count\fP, int
*\fIkeysyms_per_keycode_return\fP\^); 
.HP
int XDisplayKeycodes\^(\^Display *\fIdisplay\fP\^, int
*\fImin_keycodes_return\fP\^, int *\fImax_keycodes_return\fP\^); 
.HP
int XSetModifierMapping(\^Display *\fIdisplay\fP, XModifierKeymap
*\fImodmap\fP\^); 
.HP
XModifierKeymap *XGetModifierMapping(\^Display *\fIdisplay\fP\^); 
.HP
XModifierKeymap *XNewModifiermap(\^int \fImax_keys_per_mod\fP\^); 
.HP
XModifierKeymap *XInsertModifiermapEntry\^(\^XModifierKeymap *\fImodmap\fP,
KeyCode \fIkeycode_entry\fP, int \fImodifier\fP\^); 
.HP
XModifierKeymap *XDeleteModifiermapEntry\^(\^XModifierKeymap *\fImodmap\fP,
KeyCode \fIkeycode_entry\fP, int \fImodifier\fP\^); 
.HP
int XFreeModifiermap(\^XModifierKeymap *\fImodmap\fP\^); 
.SH ARGUMENTS
.IP \fIdisplay\fP 1i
Specifies the connection to the X server.
.ds Kc changed or returned
.IP \fIfirst_keycode\fP 1i
Specifies the first KeyCode that is to be \*(Kc.
.IP \fIkeycode_count\fP 1i
Specifies the number of KeyCodes that are to be returned.
.IP \fIkeycode_entry\fP 1i
Specifies the KeyCode. 
.IP \fIkeysyms\fP 1i
Specifies an array of KeySyms.
.IP \fIkeysyms_per_keycode\fP 1i
Specifies the number of KeySyms per KeyCode.
.IP \fIkeysyms_per_keycode_return\fP 1i
Returns the number of KeySyms per KeyCode.
.IP \fImax_keys_per_mod\fP 1i
Specifies the number of KeyCode entries preallocated to the modifiers
in the map.
.IP \fImax_keycodes_return\fP 1i
Returns the maximum number of KeyCodes.
.IP \fImin_keycodes_return\fP 1i
Returns the minimum number of KeyCodes.
.IP \fImodifier\fP 1i
Specifies the modifier.
.IP \fImodmap\fP 1i
Specifies the 
.ZN XModifierKeymap
structure.
.IP \fInum_codes\fP 1i
Specifies the number of KeyCodes that are to be changed.
.SH DESCRIPTION
The
.ZN XChangeKeyboardMapping
function defines the symbols for the specified number of KeyCodes
starting with first_keycode.
The symbols for KeyCodes outside this range remain unchanged.  
The number of elements in keysyms must be:
.LP
.Ds
num_codes * keysyms_per_keycode
.De
.LP
The specified first_keycode must be greater than or equal to min_keycode 
returned by
.ZN XDisplayKeycodes ,
or a 
.ZN BadValue 
error results.
In addition, the following expression must be less than or equal to 
max_keycode as returned by
.ZN XDisplayKeycodes ,
or a
.ZN BadValue 
error results:
.LP
.Ds
first_keycode + num_codes \- 1
.De
.LP
KeySym number N, counting from zero, for KeyCode K has the following index
in keysyms, counting from zero: 
.LP
.Ds 
(K \- first_keycode) * keysyms_per_keycode + N
.De
.LP
The specified keysyms_per_keycode can be chosen arbitrarily by the client
to be large enough to hold all desired symbols. 
A special KeySym value of 
.ZN NoSymbol 
should be used to fill in unused elements 
for individual KeyCodes.  
It is legal for 
.ZN NoSymbol 
to appear in nontrailing positions
of the effective list for a KeyCode.
.ZN XChangeKeyboardMapping
generates a 
.ZN MappingNotify 
event.
.LP
There is no requirement that the X server interpret this mapping. 
It is merely stored for reading and writing by clients.
.LP
.ZN XChangeKeyboardMapping
can generate
.ZN BadAlloc 
and
.ZN BadValue 
errors.
.LP
The
.ZN XGetKeyboardMapping
function returns the symbols for the specified number of KeyCodes
starting with first_keycode.
The value specified in first_keycode must be greater than 
or equal to min_keycode as returned by
.ZN XDisplayKeycodes ,
or a
.ZN BadValue 
error results.
In addition, the following expression must be less than or equal 
to max_keycode as returned by
.ZN XDisplayKeycodes :
.LP
.Ds 
first_keycode + keycode_count \- 1
.De
.LP
If this is not the case, a 
.ZN BadValue 
error results. 
The number of elements in the KeySyms list is:
.LP
.Ds 
keycode_count * keysyms_per_keycode_return
.De
.LP
KeySym number N, counting from zero, for KeyCode K has the following index
in the list, counting from zero: 
.Ds
(K \- first_code) * keysyms_per_code_return + N
.De
.LP
The X server arbitrarily chooses the keysyms_per_keycode_return value 
to be large enough to report all requested symbols. 
A special KeySym value of 
.ZN NoSymbol 
is used to fill in unused elements for
individual KeyCodes.
To free the storage returned by 
.ZN XGetKeyboardMapping ,
use
.ZN XFree .
.LP
.ZN XGetKeyboardMapping
can generate a
.ZN BadValue 
error.
.LP
The
.ZN XDisplayKeycodes
function returns the min-keycodes and max-keycodes supported by the
specified display.
The minimum number of KeyCodes returned is never less than 8,
and the maximum number of KeyCodes returned is never greater than 255.
Not all KeyCodes in this range are required to have corresponding keys.
.LP
The
.ZN XSetModifierMapping
function specifies the KeyCodes of the keys (if any) that are to be used 
as modifiers.
If it succeeds,
the X server generates a
.ZN MappingNotify
event, and
.ZN XSetModifierMapping
returns
.ZN MappingSuccess .
X permits at most 8 modifier keys.
If more than 8 are specified in the
.ZN XModifierKeymap
structure, a
.ZN BadLength
error results.
.LP
The modifiermap member of the 
.ZN XModifierKeymap
structure contains 8 sets of max_keypermod KeyCodes, 
one for each modifier in the order 
.ZN Shift , 
.ZN Lock , 
.ZN Control , 
.ZN Mod1 , 
.ZN Mod2 , 
.ZN Mod3 , 
.ZN Mod4 , 
and 
.ZN Mod5 .
Only nonzero KeyCodes have meaning in each set, 
and zero KeyCodes are ignored.
In addition, all of the nonzero KeyCodes must be in the range specified by 
min_keycode and max_keycode in the 
.ZN Display 
structure,
or a 
.ZN BadValue 
error results.
.LP
An X server can impose restrictions on how modifiers can be changed, 
for example,
if certain keys do not generate up transitions in hardware,
if auto-repeat cannot be disabled on certain keys,
or if multiple modifier keys are not supported.  
If some such restriction is violated, 
the status reply is
.ZN MappingFailed ,
and none of the modifiers are changed.
If the new KeyCodes specified for a modifier differ from those
currently defined and any (current or new) keys for that modifier are
in the logically down state, 
.ZN XSetModifierMapping
returns
.ZN MappingBusy , 
and none of the modifiers is changed.
.LP
.ZN XSetModifierMapping
can generate
.ZN BadAlloc
and 
.ZN BadValue
errors.
.LP
The
.ZN XGetModifierMapping
function returns a pointer to a newly created
.ZN XModifierKeymap
structure that contains the keys being used as modifiers.
The structure should be freed after use by calling
.ZN XFreeModifiermap .
If only zero values appear in the set for any modifier, 
that modifier is disabled.
.LP
The
.ZN XNewModifiermap
function returns a pointer to
.ZN XModifierKeymap
structure for later use.
.LP
The
.ZN XInsertModifiermapEntry
function adds the specified KeyCode to the set that controls the specified
modifier and returns the resulting
.ZN XModifierKeymap
structure (expanded as needed).
.LP
The
.ZN XDeleteModifiermapEntry
function deletes the specified KeyCode from the set that controls the
specified modifier and returns a pointer to the resulting
.ZN XModifierKeymap
structure.
.LP
The
.ZN XFreeModifiermap
function frees the specified
.ZN XModifierKeymap
structure.
.SH STRUCTURES
The
.ZN XModifierKeymap
structure contains:
.LP
.Ds 0
typedef struct {
        int max_keypermod;      /\&* This server's max number of keys per modifier */
        KeyCode *modifiermap;   /\&* An 8 by max_keypermod array of the modifiers */
} XModifierKeymap;
.De
.SH DIAGNOSTICS
.TP 1i
.ZN BadAlloc
The server failed to allocate the requested resource or server memory.
.TP 1i
.ZN BadValue
Some numeric value falls outside the range of values accepted by the request.
Unless a specific range is specified for an argument, the full range defined
by the argument's type is accepted.  Any argument defined as a set of
alternatives can generate this error.
.SH "SEE ALSO"
XFree(__libmansuffix__),
XkbGetMap(__libmansuffix__),
XSetPointerMapping(__libmansuffix__) 
.br
\fI\*(xL\fP
